Book/Report FZJ-2018-00578

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png
Schwingungsverhalten von Zwischengitteratomen



1975
Kernforschungsanlage Jülich, Verlag Jülich

Jülich : Kernforschungsanlage Jülich, Verlag, Berichte der Kernforschungsanlage Jülich 1259, 110 p., Anh. ()

Please use a persistent id in citations:

Report No.: Juel-1259

Abstract: The vibrational behaviour of crystals with point defects, especially with self-interstitials, is discussed with particular emphasis on defect-induced resonant and localised modes. For low-frequency resonant modes, an analytical expression for the Green's function of the defect is derived starting from a method due to Krumhansl and Matthew. The Green's function has the form of the Green's function of an onedimensional oscillator with an effective force constant f$^{eff}$, an effective mass M$^{eff}$ and a velocity-dependent damping determined by f$^{eff}$ and M$^{eff}$. Simple approximations for these effective quantities are given. The vibrational properties of self-interstitials in the octahedral and 100-dumbbell configuration in a fee lattice are treated in detail. For simple forceconstant-models the local frequency spectra are calculated for both configurations showing that the interstitial only vibrates with high-frequency localised modes and with low-frequency resonant modes. Furthermore the influence of the resonant modes on physical properties such as the change of elastic constants of phonon dispersion curves and of specific heat is discussed.


Contributing Institute(s):
  1. Publikationen vor 2000 (PRE-2000)
Research Program(s):
  1. 899 - ohne Topic (POF3-899) (POF3-899)

Database coverage:
OpenAccess
Click to display QR Code for this record

The record appears in these collections:
Document types > Reports > Reports
Document types > Books > Books
Workflow collections > Public records
Institute Collections > Retrocat
Publications database
Open Access

 Record created 2018-01-18, last modified 2021-01-29